UD3-71 ultrasonic portable flaw detector

TCG level is set up in the point grid connected by linear sections, i.e. it is possible to set sundry TCG curve forms – piecewise-linear, step etc. TCG level corresponds to the signal attenuation in the given point relative to the set gain value. This option allows to test long-length items and items made from materials with great attenuation, it is also used for sensitivity setup when testing weld joints with wall thickness of more than 12 mm.

DAC mode is an alternative to TCG mode and enables to plot the curve which connects points (corresponding to signals peaks) on the screen, and also to plot up to 2 additional curves which is the preset value dB distant from the base one. DAC mode also allows quick and convenient TCG curve plotting.

"REFLECTIONS MARKING" mode helps to imagine the detected defect location in the testing item in the same direction as ultrasonic beams (straight and multiple-reflected beam).

"Peak" mode is indispensable during small defects search, operation in unstable acoustic coupling conditions. Upon that, the current signal value is displayed on the screen concurrently with the max. signal envelope of all observable echo-signals (displayed in red color). This mode is applied for max. echo-signal amplitude determination and conditional length estimation. It can be used for testing results registration both for rejected and in-order items, what will confirm the presence or absence of defects throughout the whole scanning perimeter. Thus, "Peak" mode application increases results reliability and reduces testing time.

UD3-71 flaw detector distinctive feature is the measurement of equivalent defects dimensions.
Using DGS diagrams UD3-71 flaw detector enables to measure equivalent defects dimensions in the range from 0,8 to 20,0 mm (equivalent defect diameter) with relevant error which does not exceed 15 %.
Availability of the algorithm (built in flaw detector software) of automatic plotting of DGS diagrams for various probes types makes it possible to analyze the received data quickly and qualitatively and determine equivalent dimensions of the detected discontinuities with their further registration. To save the time which is used for the instruments setup, UD3-71 instrument software contains the function of automatic TCG curve plotting by DGS diagram plotted for a specific probe.

To measure precisely the item thickness and defects coordinates, the undetected RF (radio frequency) signal is used what enables to assure the measurement resolution of 0,01 mm. Two modes of the point selection on the signal oscillogram by which the measurements are taken (automatic and manual) are provided in the instrument.

This mode is applied for solving special-purpose tasks. For example, when testing various single-type parts or when the part has many testing area. For solving this task "Special program interface" system is used in UD3-71. The necessary standard setups and program interface of "Special program interface" enter flaw detector from PC. The input setups are protected from illegal change by NDT inspector (operator).

is essential for data transmission from the flaw detector memory to the computer memory and vice-versa. It is used for transmitting "А-scans" and "B-scans" to PC for reports creation on the basis of testing results or databases. If required, the user can input setups for specific testing types in flaw detector from PC via in-built USB port what considerably reduces the time of flaw detector preparation for testing execution.